Sergei Skripal is a former Russian military officer and double agent who worked for British intelligence. He was born in 1951 in Russia and became known for his espionage activities, particularly for providing information about Russian intelligence to the United Kingdom. In March 2018, Skripal and his daughter, Yulia Skripal, were poisoned in Salisbury, England, using a nerve agent called Novichok. This incident led to a major international crisis, with accusations against Russia for the attack, which Russia has denied. The event raised concerns about chemical weapons and espionage in modern geopolitics.